Wheel-truing device for grinding machines



March 13, 1928.

A. M. DRAKE WHEEL TRUING DEVICE FOR GRINDING MACHINES Filed Aug. 18, 1927 2 Sheets-Sneet l March 13, 1928.

A. M. DRAKE WHEEL TRUING DEVICE FOR GRINDING MACHINES 2 Sheets-Sheet 2 Filed Aug. 18, 1927 Patented Mar. 13, 1928.

UNITED STATES PATENT OFFICE.

ALDEN M. DRAKE, OF GREENFIELD, MASSACHUSETTS, ASSIGNOR TO GREENFIELD TAP AND DIE CORPORATION, OF GREENFIELD. MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

. WHEEL-TRUING DEVICE FOR GRINDING MACHINES.

Application filed August 18, 1927. Serial No. 213,948.

This application is in part a continuation of a prior application, Serial No. 193,469 filed by me May 23, 1927.

This invention relates to a grinding ma- 5 chine of the general type in which the work is supported at the front end of a hollow work spindle, and in which the wheelis presented to the work from the rear through said hollow spindle.

10 My invention relates particularly to improved means for truing the grinding wheel within the hollow work spindle, and to improved mechanism for supporting, positioning and angularly adjusting the wheel truing 1!} tool or diamond point. 3

A specific object of my invention is to provide a construction in which the truing tool may be adjusted either about its own axis or transversely of the work spindle by the'oper- 20 ator, while he remains in his usual operating position at the front of the machine. I also provide means by which the amount of transverse adjustment may be visually determined from the same position,

25 A further object of the invention is to provide for convenient adjustment of the truing tool axially of the hollow work spindle.

My invention further, relates to arrangements and combinations of parts which will 30 be hereinafter described and more particu-- mounted in a bearing in the end portion 26 larly pointed out in the appended claims.

A preferred form of the inventlon is shown in the drawings in which Fig. l-i's an end elevation of portions of. a 35 grinding machine having my improvements applied thereto;

Fig. 2 is a sectional plan view of the truing device, its supporting'slide, and the crossfeeding mechanism, taken along the line 2-2 4 in Fig. 1;

Fig. 3 is a sectional plan View of the mechanism for adjusting the trulng tool angularly, taken along the line 33 in Fig. 1;

Fig. 4 is 'a detail sectional VIEW, taken along the line 4-,4 in Fig, 3;

Fig. 5 is a detail sectional view, taken along the line 5-5 in Fig. 1;

Fig. 6 is a sectional end elevatlon of the slide, taken along the line 6-6 in Fig. 1'; and 50 Fig. 7 is a detail end view, looking in the direction'of the arrow 7 in Fig. 1.

Referring to the drawings, I have indicatedthe work K as being mounted at the truing tool which ma front'end of a work spindle 10 rotatably supported in bearings in a work head 11. A gr nd ng wheel W is supported at the front end of a wheel spindle 12, rotatable in a wheel head 13. Mechanism, notshown, is provided for causing relative axial movement of the wheel andwork, by which the wheel is caused to traverse the cylindrical innor surface to be ground.

A two-part dove-tailed horizontal guideway formed on the rear faces of members 14 and 15 slidably mounted at the sides of the work head 11. I The two parts of the guideway are at opposite sides of the spindle axis. A cross slide (Figs. 1 and 6) is provided with an upper guiding portion 21 (Fig. 6) and a lower adjustable guide portion or gib 22 by which the cross slide 20 may be mounted on the dove-tailed guideway on the work head, and may be accurateily ad usted to slide in close contact therewlt The slide 20 has a portion projecting forbeing substantially U-shaped, as shown in Fig. 6, and comprising segmental up or and lower side members 25 and a'connecting end member 26, all firmly supported by the cross slide 20. s

A tool holder (Fig. 2) is rotatably and supports a diamond point 31 or other be secured in. a tapered spindle 32 seate( in the tool holder 30. Worm gear teeth are cut on the periphery of the holder 30 and are engaged by a worm 33 (Fig. 4? at the lower end of a short shaft 34 rotatab mounted in the end portion 26.

' The s aft 34 is connected by bevel gears 35 to a cross shaft 36, rotatably mounted in the upper segmental portion 25 of the cross slide pro'ection. The cross shaft 36 is connected evel gears 37 to the inner end of a band e shaft 38, extending outwardly in the cross slide 20 and having a hand wheel or knob 39 at its outer end.

The shaft '38 is of such lengththat the ion knob 39 is well beyond the side face of the wheel head, so that it may be conveniently reached by the operator while at the front of the machine. By turnin the knob 39, the operator can angularly ad ust the tool holder 30 to vary the angular position of the diaill mend whenever it becomes worn in a given angular position.

The tool slide 20 is provided with a nut (Fig. 2), within which is threaded a lead screw 41, mounted in a bearing 42, secured in the sliding supporting member 14. Bevel gears 43 and at connect the screw 41 to an actuating shaft 415 extending forward through a bearing in the member 1a and having a hand wheel or knob 47 at its front end.

The shaft is also provided with a graduated disc 48, adjustably secured thereto and revolving adjacent an index plate or pointer 49, fixed on the wheel head or relative thereto. The shaft 45 preferably projects forward outside of the wheel head 11 and the wheel or knob 4:7 is very conveniently positioned at the front of the machine and within easy reach of the operator, who is thus able to adjust the diamond point 31 transversely toward or away from the wheel "W, and at the same time may observe the amount of adjustment on the graduated disc 48.

if have also provided means for adjusting the diamond point 31 axially within the work-supporting spindle 10. F or this purpose it provide the supporting members 1d and 15 with upper and lower guide portions 50 and 51 (Fig. 1) adapted to engage dovetailed guideways 52 formed on the opposite sides of the work-supporting head 11. The

till

lower guide'portions 51 are made in the form of adjustable gibs, by which a close sliding fit may beinsured.

lln order to move the members 14 and 15 along the guidewa s 52, 1 provide rack bars 55 (Figs, 1 and 'i' secured thereto and en- 7 gaged by pinions 56, formed at the opposite ends of a cross shafto'i' mounted inbearings 58 and 59 in. the wheel head 11. The shaft 57 is provided with a knob or handle 60 by which it may be rotated. Manual rotation of the shaft 57 will thus cause simultaneous forward orrearward movement of thesupporting members 14 and 15, thus adjustin the diamond point or truing device 31 axially within the work spindle 10 toward or away from the rear face of the work K.

l have thus provided a construction in which the truing device is firmly and rigidly supported on along sliding hearing at the rear. of the work head, in position to cooperate with a grinding wheel within the work head, and T have also provided operating mechanism by which the diamond point may be conveniently adjusted b the operator, either angularly, transverse yor axially of the work, and without leaving his operating position.

Having thus described my invention and the advantages thereof, 1 do not wish to be limited'to the details herein disclosed otherneeaaaa wise than as set forth inthe claims, but what ll claim is 2- 1. Tn a grinding machine having a work head, a hollow work-supporting spindle rotatably mounted in a bearing therein and a grinding wheel mounted for axial withdrawal from the work within said hollow spindle, a cross slide mounted at the rear of said work head and having a slide bearing at both sides of the work spindle axis, said slide having a portion projecting forward within said hollow spindle, and a truing device supported on said forwardly projecting portion.

2. The combination in a grinding machine as set forth in claim 1, in which an actuating shaft is mounted in hearings on said work head and extends forward parallel to said work spindle towards the front of the ma chine, said shaft being equipped for manual operation and being positively connected to move said slide transversely.

3; The combination in a grinding machine as set forth in claim 1, in which an actuating shaft is mounted in hearings on said work head and extends forward parallel to said work spindle towards the front of the machine, and in which a lead screw is geared to said actuating shaft and is threaded in a nut on said cross slide, by which connection said slide ma be accurately adjusted transversely 0t said work spindle. I

d. The combination in a grinding machine as set forth in claim 1, in which an actuating shaft is mounted in hearings on said work head and extends forward parallel to said work spindle towards the front of the machine, and in which a lead screw'is geared to said actuating shaft and is threaded in a nut on said cross slide, and in which a graduated indicating device is provided for determing the angular adjustment of said actuating shaft.

5. in a grinding machine having a grinding wheel, a work head and a hollow worksupporting spindle mounted in a bearing therein, a cross slide mounted at the rear of said heads, and a truin device mounted on a portion of'said cross s ide projecting within said work spindle, said truing device comprising a holder supporting a diamond point portion, and means by which said holder may moved angularly about its axis.

6. The combination in a grinding machine as setforth in claim 5, in which said adand rotatably mounted'in said projectingv projecting portion and having a worm and gear connection with said holder, a handle shaft mounted on said slide and projecting outward beyond said wheel head, and a cross shaft mounted to extend axially of the projetting portion and geared to said handle shaft and to said worm shaft, providing a positive geared connection between said handle shaft and said tool holder by which said holder may be accurately adjusted angularly.

8. In a grinding machine having a work head, a hollow work-supporting spindle rotatably mounted in a bearing therein and a grinding wheel mounted for axial withdrawal from the work within said hollow spindle, a cross slide mounted at the rear of said work head and having a portion projecting forward within said hollow spindle, supporting members for said cross slide mounted at opposite sides of said work head for adjustment axially thereof, said cross slide being movable in said supporting memhers transversely to the axis of the grinding members.

10. The combination in a grinding machine as set forth in claim 8, in which means is provided for simultaneous forward and rearward adjustment of said supporting members, said means including a handle accessible from the front of the machine, and positive geared connections manually operable by said handle and effective to move said supporting members simultaneously in either a forward or a rearward direction. 1

In testimony whereof I have hereunto affixed my signature.

ALDEN M. DRAKE. 

